I have enough music on my phone that I have filled my 2gb card but I have a lot of tunes on it. 4gb should be sufficient but the more you want to store the bigger the better. I also download pictures I have taken each time I get to the computer so I am not storing more than 3 or 4 pics on it.

If you're not using music then the only reason for a Micro SD would be for pictures and Ringtones for the most part. GPS Apps will load on the phone not the SD Card so 2gb should be more than enough. A 1gb card would probably serve your purpose.

Ill have ringtones. I usually make my own. Im going to load my own games. The GPS Im going to use is an on-board GPS so Ill need a place to store it. I believe it is about 1.33Gbs so Ill need atleast a 2Gb card. I have a 1Gb card, but its in my Razr V3M.

Ill have ringtones. I usually make my own. Im going to load my own games. The GPS Im going to use is an on-board GPS so Ill need a place to store it. I believe it is about 1.33Gbs so Ill need atleast a 2Gb card. I have a 1Gb card, but its in my Razr V3M.

Hmm... Everything I've read is that you can't put applications on removable media (i.e. Micro SD card). News to me. Let us know how it goes.